skia: Conditionally link QC opt library
skia: Conditionally link QC opt library

 * So far this is in use by 8994 only, but that will likely change.

Change-Id: I5a003ad2fe06c21b315a5e6dfafb3b3deaffa50d

TeamExodus/external_skia,BrokenROM/external_skia,MarshedOut/android_external_skia,MarshedOut/android_external_skia,spezi77/android_external_skia,MarshedOut/android_external_skia,BrokenROM/external_skia,PAC-ROM/android_external_skia,invisiblek/android_external_skia,BrokenROM/external_skia,TeamExodus/external_skia,invisiblek/android_external_skia,TeamExodus/external_skia,MarshedOut/android_external_skia,invisiblek/android_external_skia,MarshedOut/android_external_skia,PAC-ROM/android_external_skia,invisiblek/android_external_skia,invisiblek/android_external_skia,MarshedOut/android_external_skia,TeamExodus/external_skia,PAC-ROM/android_external_skia,invisiblek/android_external_skia,spezi77/android_external_skia,MarshedOut/android_external_skia,spezi77/android_external_skia,PAC-ROM/android_external_skia,MarshedOut/android_external_skia,invisiblek/android_external_skia,PAC-ROM/android_external_skia,BrokenROM/external_skia,PAC-ROM/android_external_skia,spezi77/android_external_skia,TeamExodus/external_skia,PAC-ROM/android_external_skia,invisiblek/android_external_skia,BrokenROM/external_skia,spezi77/android_external_skia,BrokenROM/external_skia,PAC-ROM/android_external_skia,BrokenROM/external_skia,TeamExodus/external_skia,PAC-ROM/android_external_skia,MarshedOut/android_external_skia,TeamExodus/external_skia,TeamExodus/external_skia,BrokenROM/external_skia,TeamExodus/external_skia,spezi77/android_external_skia